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Titanium silicalite-1 macrostructures for photocatalytic removal of organic pollutants from aqueous media

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Abstract

Titanium silicalite-1 (TS-1) structures in the form of macroscopic beads with hierarchical porosity were prepared by the resin templating method. The Ti content within the samples was varied between 1 and 7 wt%, with corresponding surface areas ranging from 725 to 350 m2 g−1, respectively. The samples contained a large amount of amorphous material, which was necessary to achieve high mechanical stability of the beads. The TS-1 macrostructures were used as catalysts for the photocatalytic degradation of methylene blue (MB), and results were compared to the results for a commercial anatase nanopowder (CristalACTiV™ PC500). All TS-1 beads showed similar MB degradation rates independently of their Ti content, which was linked to variations in the surface areas and structure. The macroscopic shape of the TS-1 beads allowed easy recovery from the mother liquor upon decolouration of the MB solutions, which was highly beneficial compared to the reference anatase nanopowder. The TS-1 beads could be reused in subsequent photocatalytic cycles after decanting exhausted solutions and replacing with fresh MB solutions without any energy-consuming regeneration steps involved. The samples were tested in five consecutive cycles and MB degradation rates remained broadly unchanged during all tests.

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Authors and Affiliations

  1. Faculty of Science and Engineering, Manchester Metropolitan University, Chester Street, Manchester, M1 5GD, UK

    S. P. D. Ormond, M. Ratova, P. Kelly, M. Edge & L. Tosheva

  2. Mineralogisch-Petrographisches Institut, Universität Hamburg, Grindelallee 48, 20146, Hamburg, Germany

    B. Mihailova

Authors
  1. S. P. D. Ormond
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  2. M. Ratova
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  3. P. Kelly
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  4. M. Edge
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  6. L. Tosheva
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Correspondence to L. Tosheva.

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Ormond, S.P.D., Ratova, M., Kelly, P. et al. Titanium silicalite-1 macrostructures for photocatalytic removal of organic pollutants from aqueous media. J Porous Mater 23, 1421–1429 (2016). https://doi.org/10.1007/s10934-016-0202-3

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